- Patients with a history of any one or more of the following cardiovascular conditions within the past 6 months: Cardiac angioplasty or stenting; Myocardial infarction; Unstable angina; Coronary artery bypass graft surgery; Symptomatic peripheral vascular disease; Class III or IV congestive heart failure, as defined by the New York Heart Association (NYHA) [See Section YYY Appendix Y for description